Qhov Tseem Ceeb Qhov txawv - Meiosis vs Gametogenesis
Meiosis yog ib hom kev faib cell uas tshwm sim thaum lub sij hawm kev sib deev rau kev sib deev ntawm tes. Thaum lub sij hawm meiosis, tus lej chromosome raug txo los ntawm ib nrab kom tswj tau tus lej chromosome hauv zygote. Cov txiv neej thiab poj niam chromosomes cais thiab muab faib mus rau hauv ib tiam zuj zus. Muaj ob theem tseem ceeb ntawm meiosis uas yog meiosis I thiab meiosis II. Zoo ib yam li mitosis, meiosis kuj muaj cov theem hu ua prophase, metaphase, anaphase, thiab telophase. Thaum kawg ntawm meiotic cell division, plaub tus ntxhais cell yog tsim nrog ib tug haploid tooj ntawm chromosomes. Gametogenesis yog cov txheej txheem uas tsim gametes rau kev sib deev. Meiosis yog xav tau rau gametogenesis. Qhov sib txawv tseem ceeb ntawm meiosis thiab gametogenesis yog, meiosis yog txheej txheem ntawm tes faib thaum gametogenesis yog txheej txheem ntawm gamete tsim.
Meiosis yog dab tsi?
Meiosis yog hom kev faib cell uas tsim cov hlwb haploid los ntawm diploid niam txiv hlwb. Los ntawm ib lub cell diploid, plaub lub hlwb haploid yog tsim los ntawm meiosis. Meiosis tshwm sim thaum muaj kev sib deev. Gamete los yog kev sib deev ntawm tes yog lub hom phiaj ntawm meiosis tshwm sim hauv cov kab mob sib deev. Meiosis muaj ob lub cell faib ua tiav; Meiosis I thiab Meiosis II. Li no, nws ua rau plaub tus ntxhais lub hlwb uas muaj ib nrab ntawm cov khoom siv caj ces ntawm niam txiv lub hlwb. Hauv txhua qhov meiosis, muaj plaub theem; prophase, metaphase, anaphase, thiab telophase. Ua ke muaj yim theem hauv meiotic cell division.
Daim duab 01: Meiosis
Thaum lub sijhawm meiotic prophase, bivalents tau tsim, thiab cov caj ces muaj nyob hauv cov ntsiab lus hu ua chiasma. Bivalent los yog tetrad yog ib lub koom haum ntawm homologous chromosomes tsim thaum lub sij hawm prophase I ntawm meiosis. Chiasma yog qhov chaw sib cuag qhov twg ob homologous chromosomes tsim ib qho kev sib txuas ntawm lub cev lossis kev hla. Kev hla dhau qhov tshwm sim genetic khoom sib xyaw ntawm homologous chromosomes. Yog li qhov tshwm sim gametes yuav tau txais cov noob tshiab ua ke uas qhia txog kev hloov pauv caj ces ntawm cov xeeb ntxwv.
Gametogenesis yog dab tsi?
Thaum kev sib deev, gametes yog tsim los ntawm gametogenesis. Hauv tib neeg, ob hom gametes raug tsim. Lawv yog poj niam gametes (qe) thiab txiv neej gametes (sperms). Cov gametes sib sau ua ib lub zygote los ntawm fertilization. Nws yog ib qho tseem ceeb hauv cov ntsiab lus ntawm kev yug me nyuam. Gametogenesis yog ob hom, txiv neej gametogenesis (spermatogenesis) thiab poj niam gametogenesis (oogenesis). Spermatogenesis thiab oogenesis tshwm sim hauv gonads; testis thiab zes qe menyuam feem. Ob txheej txheem ua tiav peb theem; multiplication, loj hlob thiab maturation. Gametogenesis cuam tshuam nrog meiosis qhov twg spermatogenesis thiab oogenesis tsim ob pawg ntawm haploid (n) chromosomes.
Spermatogenesis yog txheej txheem uas tsim cov txiv neej gametes; cov phev. Cov txheej txheem no tshwm sim nyob rau hauv lub epithelial hlwb ntawm seminiferous tubules. Cov tubules seminiferous yog cov qauv muaj nyob rau hauv lub testis. Thaum pib, mitosis tshwm sim nyob rau hauv lub epithelium qhov chaw ceev ceev ntawm cell division ua rau tsim ntau spermatogonia uas tom qab ntawd loj hlob mus rau hauv diploid (2n) thawj spermatocyte. Thawj cov spermatocyte dhau mus rau thawj theem meiosis (meiosis I) uas ua rau haploid (n) cov spermatocytes thib ob. Txhua tus thawj spermatocyte muab nce mus rau ob theem nrab spermatocytes. Qhov thib ob spermatocytes ua tiav meiosis II uas ua rau tsim ntawm 04 spermatids los ntawm txhua tus spermatocyte thib ob. Cov spermatids ua rau cov phev paub tab. Cov txheej txheem yog tswj los ntawm hypothalamus thiab anterior pituitary. Lub hypothalamus secretes GnRH (gonadotrophin tso cov tshuaj hormones) uas ua rau lub anterior pituitary tso tawm follicle stimulating hormone (FSH) thiab Luteinizing hormone (LH). Ob qho tshuaj hormones koom nrog hauv kev loj hlob thiab kev loj hlob ntawm cov phev.
LH kuj txhawb kev tsim cov testosterone uas ua rau kev loj hlob ntawm spermatogonia. Tus nqi ntawm spermatogenesis yog tswj los ntawm kev tawm tswv yim tsis zoo uas cuam tshuam los ntawm glycoprotein hormone; Inhibin tso tawm los ntawm Sertoli hlwb. Inhibin txo tus nqi ntawm spermatogenesis los ntawm kev cuam tshuam rau lub anterior pituitary uas inhibits qhov tso tawm ntawm FSH.
Cov txheej txheem ntawm kev tsim cov poj niam gametes yog hu ua oogenesis. Oogenesis pib tshwm sim hauv Oogonium thiab cov poj niam qe raug tsim ua ntej yug. Oogonia yog tsim thaum lub sij hawm fetal theem. Lawv raug mitosis, thiab thawj oocytes yog tsim los ntawm kev faib cell ceev. Nws yog npog los ntawm ib txheej ntawm cov hlwb hu ua granulosa hlwb. Tag nrho cov qauv yog hu ua primordial follicles.
Daim duab 02: Gametogenesis
Thaum yug los, ib tug poj niam me nyuam muaj ob lab lub hauv paus hauv paus. Nyob rau hauv tag nrho lub sij hawm ntawm cov me nyuam, cov thawj oocytes tseem nyob rau hauv prophase theem ntawm thawj theem ntawm meiosis (meiosis I). Nrog rau qhov pib ntawm kev puberty, tus naj npawb ntawm primordial follicles txo mus rau 60000 txog 80000 hauv txhua lub zes qe menyuam. Meiosis kuv ua tiav hauv kev tsim ntawm haploid (n) oocyte theem nrab. Lub zes qe menyuam ua tiav meiosis II thaum cov txheej txheem fertilization tiav. Zoo ib yam li spermatogenesis, GnRH, LH thiab FSH koom nrog kev tswj hwm ntawm oogenesis. Progesterone tswj tus nqi.
Dab tsi yog qhov zoo sib xws ntawm Meiosis thiab Gametogenesis?
- Ob leeg meiosis thiab gametogenesis ua rau cov hlwb haploid.
- Ob txheej txheem tshwm sim hauv kev sib deev.
- Nyob rau hauv ob txoj kev, thawj lub xovtooj ntawm tes yog diploid, thiab cov cell tshwm sim yog haploid.
Qhov txawv ntawm Meiosis thiab Gametogenesis yog dab tsi?
Meiosis vs Gametogenesis |
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| Meiosis yog ib hom kev faib cell uas ua rau plaub lub hlwb haploid los ntawm diploid niam txiv cell. | Gametogenesis yog txheej txheem ntawm gamete tsim. |
Summary – Meiosis vs Gametogenesis
Meiosis yog ib hom kev faib cell uas tshwm sim thaum lub sijhawm sib deev ntawm tes. Meiosis tsim cov hlwb haploid los ntawm cov hlwb diploid. Cov txheej txheem ntawm kev tsim gametes yog hu ua gametogenesis. Gametogenesis suav nrog spermatogenesis thiab oogenesis thiab tshwm sim hauv kev tsim ntawm haploid (n) phev thiab qe. Meiosis yog xav tau rau gametogenesis. Qhov no yog qhov txawv ntawm meiosis thiab gametogenesis.
Download the PDF Version of Meiosis vs Gametogenesis
Koj tuaj yeem rub tawm PDF version ntawm kab lus no thiab siv nws rau offline hom phiaj raws li daim ntawv ceeb toom. Thov download PDF version ntawm no Qhov txawv Ntawm Meiosis thiab Gametogenesis
